S4E22 - "Cathexis" (VOY S1 E12)
Lt. Peter Durst is ROLLIN'
Chakotay has gone into a persistent vegetative state! Which means his spirit is free to do some light possession of Voyager crewmembers in order to turn the ship away from a nebula fool of heavy possession aliens. It's kind of a snoozer! Plus, the holobois go back to the origins of the Janeway Lambda One program to a much spookier rendition of Lord